<script lang="ts" setup name="XtxCarousel">
import { BannerItem } from '@/types/data';
import { ref, onMounted, onUnmounted } from 'vue'
// import { PropType } from 'vue'
// 1.js的defineProps(对象的写法)
// defineProps({
//   slides: {
//     type: Array as PropType<BannerItem[]>,
//     required: true,
//   },
// })

// 2.defineProps<props类型>()
const { slides, autoplay = false, duration = 3000 } = defineProps<{
  slides: BannerItem[]
  autoplay?: boolean
  duration?: number
}>()
const active = ref(0)
const onPrev = () => {
  active.value--
  if (active.value < 0) {
    active.value = slides.length - 1
  }
}
const onNext = () => {
  active.value++
  if (active.value > slides.length - 1) {
    active.value = 0
  }
}

//定时器逻辑，控制轮播
let timer: number = -1

const play = () => {
  if (!autoplay) return
  // 在模块环境编写代码时，定时器延时器，编辑器会识别成node中的定时器延时器
  // 我们要的是浏览器端的
  clearInterval(timer)
  timer = window.setInterval(() => {
    console.log('轮播图');
    onNext()
  }, duration)
}

const stop = () => {
  clearInterval(timer)
}

onMounted(() => {
  play()
})

onUnmounted(() => {
  stop()
})

</script>

<template>
  <div class="xtx-carousel" @mouseenter="stop" @mouseleave="play">
    <!-- 轮播图主体（轮播图片） -->
    <ul class="carousel-body">
      <li v-for="(item, index) in slides" :key="item.id" class="carousel-item" :class="{ fade: active === index }">
        <RouterLink to="/">
          <img :src="item.imgUrl" alt="" />
        </RouterLink>
      </li>


    </ul>
    <!-- 左边箭头 -->
    <a @click="onPrev" href="javascript:;" class="carousel-btn prev"><i class="iconfont icon-angle-left"></i></a>
    <!-- 右边箭头 -->
    <a @click="onNext" href="javascript:;" class="carousel-btn next"><i class="iconfont icon-angle-right"></i></a>
    <div class="carousel-indicator">
      <span v-for="(item, index) in slides" :key="item.id" :class="{ active: active === index }"
        @click="active = index"></span>

    </div>
  </div>
</template>

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;

  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }

    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;

      &.fade {
        opacity: 1;
        z-index: 1;
      }

      img {
        width: 100%;
        height: 100%;
      }
    }

    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;

      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;

        ~span {
          margin-left: 12px;
        }

        &.active {
          background: #fff;
        }
      }
    }

    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;

      &.prev {
        left: 20px;
      }

      &.next {
        right: 20px;
      }
    }
  }

  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
</style>